Double drawcord winding device

ABSTRACT

A double drawcord winding device has a belt pulley supported by a belt pulley bearing to mount on a webbing wheel shaft, two one-way bearings disposed on two sides of the belt pulley bearing, a second shaft sleeve securely mounted on the belt pulley and mounted around the one-way bearings, two winding devices disposed on two sides of the belt pulley and each having a first shaft sleeve extended toward the belt pulley, inserted into and mounted in one of the one-way bearings, each winding device having a winding bearing, a pull cord and a coil spring with two ends, two locating sleeves mounted on the webbing wheel shaft and mounted in the winding devices, one of the two ends of the coil spring connected to the locating sleeve, and other end connected to the winding device.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a fitness equipment, and moreparticularly to a double drawcord winding device.

2. Description of Related Art

A winding device is required in some fitness equipment, for example, apull-type rowing machine is used. A conventional pull-type rowingmachine is usually equipped with a winding device. The winding devicehas a pull cord connected to a pull rod. When the pull rod is pulled,the pull cord is pulled out. When the pull cord is pulled out, thewinding device rotates and a coil spring in the winding device istightened. The rotation of the winding device also drives a rotatingplate to rotate, and the rotating plate is linked with a damping wheel,so that the damping wheel also rotates to damp the user's pull on thepull rod. When the user releases the pull rod, the coil spring is reset,and the winding device rotates in an opposite direction to receive thepull cord. During the process of pulling and returning, the usercooperates with a sliding of a bottom seat of the conventional pull-typerowing machine to form an action that mimics rowing. The winding devicein the prior art is usually a single winding structure, that is, thereis only one pull cord, which causes limitations in use.

Then a conventional double drawcord winding device is disclosed inCN209828077U, the conventional double drawcord winding device has twowinding devices disposed on a webbing wheel shaft respectively by twobearings to rotate around the webbing wheel shaft in two directions andreturn by two coil springs. Each winding device has a pull cord woundaround thereof and a shaft sleeve securely mounted around acorresponding one-way bearing. A belt pulley is disposed between theshaft sleeves of the winding devices and has a shaft sleeve securelydisposed in the one-way bearings. In this way, the rotations of the twowinding devices can drive the belt pulley to unidirectional rotate, anda belt of the belt pulley drives a motion load.

The flaw of the above conventional double drawcord winding device isthat:

The shaft sleeve of the belt pulley is mounted on the webbing wheelshaft and is not in contact with the webbing wheel shaft, so the shaftsleeve of the belt pulley can also rotate. However, the belt pulley isthe main forced structure, when the motion load applied to the beltpulley is large or unstable, the belt pulley and its shaft sleeve arelikely to be displaced due to the force, causing an inner wall of theshaft sleeve of the belt pulley to contact the webbing wheel shaftduring movement, resulting in friction, resulting in additional movementresistance, and the shaft sleeve and the webbing wheel shaft may bedamaged by collision and scratches, affecting the life of the equipment.

In addition, since the structures of the two winding devices on bothsides must be the same, the belt pulley must be disposed in the middleof the two winding devices, that is, the distances from the belt pulleyto the two winding devices on both sides are the same. Thus the beltpulley may be restricted to use on fitness equipment of differentconstructions.

SUMMARY OF THE INVENTION

In order to overcome the aforementioned shortcomings of the conventionaldouble drawcord winding device, the present invention is provided adouble drawcord winding device that can make the structure of the doublewinding devices more stable, can increase the service life, and canadapt to fitness equipment of different structures.

The technical solution adopted by the present invention to solve thetechnical problem is as follows:

The double drawcord winding device of the present invention,characterized in that:

-   -   a belt pulley disposed on a webbing wheel shaft and supported by        a belt pulley bearing;    -   two one-way bearings respectively disposed on two sides of the        belt pulley bearing;    -   a second shaft sleeve securely mounted on the belt pulley and        having an inner hole securely mounted around exteriors of the        one-way bearings;    -   two winding devices respectively disposed on two sides of the        belt pulley, and each winding device having a first shaft sleeve        extended toward the belt pulley, inserted into and securely        mounted in one of the two one-way bearings;    -   each one of the winding devices disposed on the webbing wheel        shaft and supported by a winding bearing;    -   each one of the winding devices having a pull cord;    -   two locating sleeves securely mounted on the webbing wheel shaft        and respectively mounted in the two winding devices; and    -   each one of the winding devices having a coil spring, the coil        spring having two ends, one of the two ends connected to the        locating sleeve that is mounted in the winding device, and other        one of the two ends connected to the winding device.

Each one of the winding devices has an annular groove, and a pull cordis disposed in the annular groove of each one of the winding devices andhas an end securely connected to the corresponding winding device.

Each pull cord is closer to the belt pulley than the coil spring of thewinding device.

The belt pulley is disposed farther from one of the two winding devicesand closer to the other one of the two winding devices.

One of the locating sleeves is formed with the webbing wheel shaft bywelding, casting or engaging, the other one of the locating sleeves ismounted around the webbing wheel shaft and has an anti-rotation surface,the webbing wheel shaft has an anti-rotation surface engaging with theanti-rotation surface of the locating sleeve that is mounted around thewebbing wheel shaft, and a limit circlip is sleeved on the webbing wheelshaft and is held the locating sleeve that has the anti-rotationsurface.

The benefits of the present invention are:

In the present invention, the shaft sleeve of the belt pulley issecurely mounted around the one-way bearings that are disposed on thetwo sides of the belt pulley bearing, and the shaft sleeves of the twowinding devices on the two sides of the belt pulley are respectivelydisposed in the two one-way bearings. That is, a space is formed betweenthe shaft sleeve of the belt pulley and the webbing wheel shaft fordisposing the belt pulley bearing. The belt pulley is supported by thebelt pulley belt to mount on the webbing wheel shaft to make thestructure of the double winding devices more stable, to improve thestructural strength, and to avoid the inner wall of the shaft sleeve ofthe belt pulley contacting the webbing pulley shaft during movement.Then the service life of the equipment can be increased. In addition,the above structure can adjust the position of the belt pulley shaftrelative to the belt pulley, so that the distances between the beltpulley and the winding devices on both sides are not equal, which can beapplied to more structured fitness equipment, such as fitness equipmentswith different distances between the belt and the webbings on bothsides.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below in conjunctionwith the accompanying drawings and embodiments.

FIG. 1 is an exploded side view of a double drawcord winding device inaccordance with the present invention;

FIG. 2 is a side view in partial section of the double drawcord windingdevice of the present invention;

FIG. 3 is side view of the double drawcord winding device of the presentinvention;

FIG. 4 is a perspective view of a webbing wheel shaft and two locatingsleeves of the double drawcord winding device;

FIG. 5 is an enlarged perspective view of one of the two locatingsleeves with an anti-rotation surface;

FIG. 6 is a cross sectional side view of the webbing wheel shaft and thetwo locating sleeves of the double drawcord winding device; and

FIG. 7 is a perspective view of the double drawcord winding device ofthe present invention disposed on a stand of a rowing machine.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In order to illustrate the technical solutions of the present inventionmore clearly, the accompanying drawings required in the description willbe briefly introduced below. Obviously, the accompanying drawings in thefollowing description are only some embodiments of the presentinvention, which are very important in the art. For those skilled in theart, other embodiments can also be obtained according to these drawingswithout any creative effort. In order to facilitate the understanding ofthe present utility model, the present utility model will be describedin more detail below with reference to the accompanying drawings andspecific embodiments.

It should be noted that when an element is referred to as being “fixedto” another element, it can be directly on the other element, or one ormore intervening elements may be present therebetween. When an elementis referred to as being “connected” to another element, it can bedirectly connected to the other element or one or more interveningelements may be present therebetween. The terms “upper”, “lower”,“inner”, “outer”, “bottom”, etc. used in this specification indicate theorientation or positional relationship based on the orientation orpositional relationship shown in the accompanying drawings, and are onlyfor the convenience of describing the present invention. The presentinvention and simplified description, rather than indicating or implyingthat the indicated device or element must have a particular orientation,be constructed and operate in a particular orientation, should not beconstrued as a limitation of the present invention. Furthermore, theterms “first”, “second”, “third”, etc. are used for descriptive purposesonly and should not be construed to indicate or imply relativeimportance.

As shown in FIGS. 1, 2, and 3:

A webbing wheel shaft 2 has a belt pulley bearing 9 mounted aroundthereof at a middle part of the webbing wheel shaft 2.

A belt pulley 8 has a second shaft sleeve 81 securely mounted on thebelt pulley 8, and the second shaft sleeve 81 has an inner hole securelymounted around an exterior of the belt pulley bearing 9. Then the beltpulley 8 is supported by the belt pulley bearing 9 to dispose on thewebbing wheel shaft 2.

The belt pulley bearing 9 supports the belt pulley 8 to improve thestability and strength of the structure of the present invention, andthe displacement problem of the belt pulley 8 under heavy load isfundamentally solved.

Two one-way bearings 7 are respectively disposed on two sides of thebelt pulley bearing 9 and are mounted around the webbing wheel shaft 2.

The inner hole of the second shaft sleeve 81 is securely mounted aroundexteriors of the two one-way bearings 7.

Two winding devices 50 are respectively disposed on two sides of thebelt pulley 8, and each winding device 50 has a box 5, a cover 1, afirst shaft sleeve 51, a locating sleeve 21, 10, and a coil spring 3.

The cover 1 is connected to the box 5 to form a winding space.

The box 5 has a first shaft sleeve 51 extended toward the belt pulley 8,and the first shaft sleeve 51 is inserted into and mounted in one of thetwo one-way bearings 7. The first shaft sleeve 51 has an inner wallmounted around the webbing wheel shaft 2 without contacting with thewebbing wheel shaft 2.

A winding bearing 4 is securely mounted on the webbing wheel shaft 2,and the box 5 is securely mounted around the winding bearing 4. Then thebox 5 is disposed on the webbing wheel shaft 2 by the winding bearing 4,and the winding device 50 is supported by the winding bearing 4 on thewebbing wheel shaft 2 and can rotate in both directions around thewebbing wheel shaft 2.

In addition, due to the support of the winding bearing 4 and the innerwall of the first shaft sleeve 51 is mounted around the webbing wheelshaft 2 without contacting with the webbing wheel shaft 2, when thefirst shaft sleeve 51 is forced to rotate, the first shaft sleeve 51 isnot collide and scratch with the webbing wheel shaft 2, so it is safeand avoids the reduction of equipment life.

The box 5 has an annular groove 52 formed around the box 5, and a pullcord 6, may be a belt, is mounted in the annular groove 52 and has anend securely connected to the box 5.

The belt pulley 8 on the second shaft sleeve 81 is not located in themiddle of the two winding devices 50, but is farther from a left sidewinding device 50 and is closer to a right side winding device 50. Thebelt pulley bearing 9 and the two one-way bearings 7 are disposed in thesecond shaft sleeve 81 and are not limited by the location of the beltpulley 8. So the belt pulley 8 can be designed in the middle of thewinding devices 50, or can be offset as shown in the figures of thepresent invention. This is more suitable for fitness equipment withdifferent structures, for example, the positions of the two pull cords 6are not asymmetrical with the load position of the fitness equipment.

As shown in FIGS. 4, 5, and 6:

The webbing wheel shaft 2 has two locating sleeves 21, 10. One of thelocating sleeves 21 is formed with the webbing wheel shaft 2 by welding,casting, engaging, etc., the other one of the locating sleeves 10 has ananti-rotation surface 101, and the webbing wheel shaft 2 has ananti-rotation surface 22. When the locating sleeve 10 is mounted on thewebbing wheel shaft 2, the anti-rotation surface 101 engages with theanti-rotation surface 22, and a limit circlip 11 is sleeved on thewebbing wheel shaft 2 and is held the locating sleeve 10.

As shown in FIG. 2:

Each one of the two locating sleeves 21, 10 is mounted in the windingspace between the cover 1 and the box 5 of one of the two windingdevices 50. Each winding device 50 has a coil spring 3, the coil spring3 is disposed in the winding space between the cover 1 and the box 5. Inone of the winding devices 50, the coil spring 3 has an end connected tothe locating sleeve 21 and another end connected to an inner wall of thebox 5. In the other one of the winding devices 50, the coil spring 3 hasan end connected to the locating sleeve 10 and another end connected toan inner wall of the box 5.

The annular groove 52 is disposed closer to the belt pulley 8 than thewinding space that is formed between the cover 1 and the box 5. That is,the pull cord 6 is disposed closer to the belt pulley 8 than the coilspring 3.

In use, as shown in FIG. 7:

The webbing wheel shaft 2 is securely connected to an equipment 12, andthe equipment 12 may be a rowing machine or the like.

The pull cords 6 are pulled out by a user to drive the winding devices 5to rotate, and the coil springs 3 are deformed.

At the same time, the rotations of the first shaft sleeves 51 on theboxes drive the one-way bearings 7, and the one-way bearings 7 drive thesecond shaft sleeve 81 to rotate. Then the belt pulley 8 is rotated withthe second shaft sleeve 81 and a belt of the belt pulley 8 resists loadssuch as the blades of the rowing machine.

When the user releases the pull cords 6, the coil springs 3 are reset,the boxes 5 are reversely rotated, and the pull cords 6 are rewound intothe annular grooves 51. Since the one-way bearings 7 rotate in onedirection, the belt pulley 8 does not rotate. An action is completed.

The various embodiments in the specification are described in aprogressive manner, and each embodiment focuses on the differences fromother embodiments, and the same and similar parts between the variousembodiments can be referred to each other. The above description of thedisclosed embodiments enables those skilled in the art to implement oruse the present invention. Various modifications to these embodimentswill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be implemented in other embodimentswithout departing from the spirit or scope of the invention. Thus, thepresent invention is not intended to be limited to the embodiments shownherein, but is to be accorded the widest scope consistent with theprinciples and novel features disclosed herein.

What is claimed is:
 1. A double drawcord winding device, andcharacterized in that the double drawcord winding device comprises: abelt pulley disposed on a webbing wheel shaft and supported by a beltpulley bearing; two one-way bearings respectively disposed on two sidesof the belt pulley bearing; a second shaft sleeve securely mounted onthe belt pulley and having an inner hole securely mounted aroundexteriors of the one-way bearings; two winding devices respectivelydisposed on two sides of the belt pulley, and each winding device havinga first shaft sleeve extended toward the belt pulley, inserted into andsecurely mounted in one of the two one-way bearings; each one of thewinding devices disposed on the webbing wheel shaft and supported by awinding bearing; each one of the winding devices having a pull cord; twolocating sleeves securely mounted on the webbing wheel shaft andrespectively mounted in the two winding devices; and each one of thewinding devices having a coil spring, the coil spring having two ends,one of the two ends connected to the locating sleeve that is mounted inthe winding device, and other one of the two ends connected to thewinding device.
 2. The double drawcord winding device as claimed inclaim 1, wherein each one of the winding devices has an annular groove;and a pull cord is disposed in the annular groove of each one of thewinding devices and has an end securely connected to the correspondingwinding device.
 3. The double drawcord winding device as claimed inclaim 2, wherein each pull cord is closer to the belt pulley than thecoil spring of the winding device.
 4. The double drawcord winding deviceas claimed in claim 1, wherein the belt pulley is disposed farther fromone of the two winding devices and closer to the other one of the twowinding devices.
 5. The double drawcord winding device as claimed inclaim 1, wherein one of the locating sleeves is formed with the webbingwheel shaft by welding, casting or engaging; the other one of thelocating sleeves is mounted around the webbing wheel shaft and has ananti-rotation surface; the webbing wheel shaft has an anti-rotationsurface engaging with the anti-rotation surface of the locating sleevethat is mounted around the webbing wheel shaft; and a limit circlip issleeved on the webbing wheel shaft and is held the locating sleeve thathas the anti-rotation surface.